1) A car travels at 40 mph. what distance will it travel in 3 hours ? distance = × = 4 mph × 3 hours = 120 m / hour

2) An athlete sprints at 10m/s. how long does it take him to complete a 200m race?

Time = DISTANCE ÷ SPEED = =

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

Consider each of the electric- and magnetic-field orientations given next. in each case, what is the direction of propagation of the wave? a)\vec ein the +xdirection,\vec bin the +ydirection. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction b)\vec ein the -y direction,\vec bin the +x choose+ x direction- x direction+ y direction- y direction+ z direction- z direction c)\vec ein the +z direction,\vec bin the -x direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction d)\vec ein the +y direction,\vec bin the -z direction. choose+ x direction- x direction+ y direction- y direction+ z direction- z direction

Boiling water is an example of physical change. true or false